We probably know very little of what when on here prior to the last Ice-age. That activity was in essence a big eraser. But I can imaging perhaps people did make it here, probably across a very similar pathway on land exposed by a low sea before build up to the last ice-age Much the same way as the current indigenous peoples came 10 to 30 thousand years ago. Say the prior group came 150 to 170 years ago, killed a Mastodon or two and then flooded out over time to high ground so we see nothing of their presence here in what is under the sea. Then the last ice age come and the glaciers scours any remaining evidence from the higher ground. Couple this with all the volcanic activity in this region covering perhaps everything since that period combines to erase all clues. So we know nothing. But we do have evidence of the cycles with the sea rising and falling to allow for speculation.
